Nanostructured Mn3O4 was introduced to activated carbon by a novel sonochemical reaction and the resulting nanocomposites were investigated as supercapacitor electrodes. Not only does the sonication catalyze the redox reaction, but also promote the diffusion of the precursors, resulting in the formation of coherent nanocomposites with Mn3O4 nanoparticles grown and uniformly distributed inside the mesopores of activated carbon. This novel microstructure endows the sample with a superior performance, the specific capacitance is 150 F/g against 93 F/g of activated carbon at a charge/discharge rate of 100mA/g, and the energy density of 228 Wh/Kg against 178 Wh/Kg of activated carbon at a power density of 273W/kg in Li ion capacitors.
University of Washington, Chinese Academy of Sciences
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